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Ferric oxide crystallises in a hexagonal close-packed array of oxide

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asked Dec 12, 2017 in Chemistry by sforrest072 (157,439 points) ● 60 ● 409 ● 936

Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide

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answered Dec 12, 2017 by mdsamim (213,225 points) ● 5 ● 10 ● 15
selected Dec 12, 2017 by sforrest072
 
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Let the number of oxide (O2−) ions be x.

 So, number of octahedral voids = x 

It is given that two out of every three octahedral holes are occupied by ferric ions. 

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asked Dec 12, 2017 in Chemistry by sforrest072 (157,439 points)

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